Check the link and read what Nelson Pass has to say about VFET's. This rare unit is clean, well cared for, and working perfect. Included in the price are extra output transistors which are N.O.S. VFET's (Vertical Field Effect Transistor) also known as SIT's. Extremely rare and were ordered a long time ago as backup but never used. Still in the original Sony bag!! There are 2-2sk60 and 2-2sj18 VFET's included.There are some specialty upgraded parts inside like Black Gate, Nichicon Muse, Riken, etc.- only carefully thought out simple replacements- so basically updated stock. There was very little wrong with the original so I didn't mess with it. Nice versatility as it can be easily used as either a separate preamp or power amplifier-just pull out the external jumpers and plug in. A recent unrelated auction on Ebay for a 4650 with extra VFET's was 1000. I will ship to anywhere reasonable and will include well packed, free shipping USPS and Paypal, continental US. Condition is about 8 with very minor things here and there. The sound is of course, sublime and accurate, having the qualities of both tubes & solid state with none of the objections and flaws. Why Sony dropped the ball on the concept was very sad. Probably cost them too much $$$ to continue manufacture. Cheers!
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